The original version of "Unity" was a milestone for Alan Walker because it was co-written and produced with his fans. The acoustic version, however, offers a different experience:

This response uses data provided by Google's Knowledge Graph Unity (Acoustic) - Alan x Walkers | Sapphire Aug 30, 2019 YouTube·SAPPHIRE Sapphire - Unity (Acoustic) - SoundCloud

This response uses data provided by Google's Knowledge Graph Unity (Acoustic) - Alan x Walkers | Sapphire Aug 30, 2019 YouTube·SAPPHIRE Unity (Acoustic) - Alan x Walkers | Sapphire Aug 30, 2019 YouTube·SAPPHIRE Sapphire - Unity (Acoustic) - SoundCloud